HODL Wallet : Bitcoin Walletlatest release: 1.12 last analysed 20th December 2020
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Do your own research!
Try out searching for "lost bitcoins", "stole my money" or "scammers" together with the wallet's name, even if you think the wallet is generally trustworthy. For all the bigger wallets you will find accusations. Make sure you understand why they were made and if you are comfortable with the provider's reaction.
On the App Store the provider claims:
Your Bitcoin are stored on your device and backed up to a Backup Recovery Key when you create a wallet. This means HODL Wallet can never stop you from accessing or sending your funds.
which is not very clear. The Backup part is a bit concerning but if they had access to that, the second sentence would be wrong. This should thus be a claim of being non-custodial.
HODL Wallet is free, open source
so in their source repository one could check the claim but as iPhone apps are all currently not reproducible, the app remains not verifiable.
The app provider also shares code but we could so far not verify that the published code matches the published app!
This verdict means that the provider did share some source code but that we could not verify that this source code matches the released app. This might be due to the source being released later than the app or due to the provided instructions on how to compile the app not being sufficient or due to the provider excluding parts from the public source code. In any case, the result is a discrepancy between the app we can create and the app we can find on GooglePlay and any discrepancy might leak your backup to the server on purpose or by accident.
As we cannot verify that the source provided is the source the app was compiled from, this category is only slightly better than closed source but for now we have hope projects come around and fix verifiability issues.
The app cannot be independently verified. If the provider puts your funds at risk on purpose or by accident, you will probably not know about the issue before people start losing money. If the provider is more criminally inclined he might have collected all the backups of all the wallets, ready to be emptied at the press of a button. The app might have a formidable track record but out of distress or change in management turns out to be evil from some point on, with nobody outside ever knowing before it is too late.
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